fix: handle image size errors safely (#2871) (thanks @Suksham-sharma)

src/agents/pi-embedded-helpers.image-size-error.test.ts

@@ -0,0 +1,14 @@
+import { describe, expect, it } from "vitest";
+
+import { parseImageSizeError } from "./pi-embedded-helpers.js";
+
+describe("parseImageSizeError", () => {
+  it("parses max MB values from error text", () => {
+    expect(parseImageSizeError("image exceeds 5 MB maximum")?.maxMb).toBe(5);
+    expect(parseImageSizeError("Image exceeds 5.5 MB limit")?.maxMb).toBe(5.5);
+  });
+
+  it("returns null for unrelated errors", () => {
+    expect(parseImageSizeError("context overflow")).toBeNull();
+  });
+});